"""
@author: sumeng
@file: 三乐购物系统 练习.py
@time: 2023/4/13 15:55
"""

#购物系统类
#   实例属性 -- 商品信息、系统说明信息、当前用户--多个用户
#   方法 -- 登录、注册、查看商品、添加购物车、结算购物车

#用户类
#   实例属性 -- 用户名、密码、钱、购物车

class User:
    def __init__(self, name, passwd, init_amount):
        self.name = name
        self.passwd = passwd
        self.init_amount = init_amount
        self.shopping_cart = {}

class ShoppingSystem:
    def __init__(self, goods_info, sys_info):
        self.goods_info = goods_info
        self.sys_info = sys_info
        # 初始化为空字典
        self.userdict = {}

    def register(self, name, passwd, initial_amount):
        # 创建一个新用户，实例化user类
        if name not in self.userdict:
            user = User(name, passwd, initial_amount)
            # 用户名作为key user对象作为value存放在self.userdict里面
            self.userdict[name] = user
        else:
            print("用户已存在！")

    def login(self, name, passwd):
        if name in self.userdict and passwd == self.userdict[name].passwd:
            return True
        else:
            return False

    def check_message(self):
        print("以下为商品信息".center(40, "*"))
        for i in self.goods_info:
            print(f"{self.goods_info[i]['name']}的编号为{i},单价为{self.goods_info[i]['price']}")
        print("*" * 48)

    def add_goods(self, goods_id, goods_num, name):
        self.userdict[name].shopping_cart[goods_id] = goods_num
        print(f"加购{goods_num}个{self.goods_info[goods_id]['name']}商品成功！")

    def check_cart(self, name):
        cart = self.userdict[name].shopping_cart
        if cart:
            print("以下为购物车中的商品信息".center(40, "*"))
            for i in cart:
                print(f"{self.goods_info[i]['name']}的编号为{i},单价为{self.goods_info[i]['price']},加购了{cart[i]}件")
        else:
            print("购物车为空！")

    def pay_cart(self, name):
        cart = self.userdict[name].shopping_cart
        money = int(self.userdict[name].init_amount)
        for i in cart:
            pay = int(cart[i]) * self.goods_info[i]['price']
        if pay <= money:
            print(f"你一共需要支付{pay}元")
            self.userdict[name].init_amount = money - pay
            print(f"你的余额为{self.userdict[name].init_amount}")
            self.userdict[name].shopping_cart.clear()
        else:
            print("你的余额不足！")
            self.userdict[name].shopping_cart.clear()

fruit_goods = {
    'F0001': {"name": "apple", "price": 8},
    'F0002': {"name": "banana", "price": 4}
}

medicine_goods = {
    'M0001': {"name": "奥司他韦", "price": 60},
    'M0002': {"name": "抗病毒口服液", "price": 30}
}

system1 = ShoppingSystem(fruit_goods, "水果购物系统")
system2 = ShoppingSystem(medicine_goods, "药品购物系统")

system = [system1, system2]

while 1:
    print("当前平台已有购物系统如下：")
    for k, v in enumerate(system):
        print(f"{k}.{v.sys_info}")
    c1 = input("请输入你的选择(按q退出)：")
    if c1 == "q":
        break
    if c1.isdigit() and int(c1) < len(system):
        c1 = int(c1)
        current_system = system[c1]
        print(f"欢迎进入{current_system.sys_info}".center(40, "*"))
        while 1:
            c2 = input("1.登录\n2.注册\n请输入你的选择(按q退出):")
            if c2 == "q":
                break
            if c2 == "1":
                name, passwd = input("请输入你的名字以及密码(用密码分隔)").split()
                if current_system.login(name, passwd):
                    print("登录成功！".center(40, "*"))
                    while 1:
                        print("*" * 48)
                        print("1、查看商品信息".center(40))
                        print("2、将商品加入购物车".center(40))
                        print("3、查看购物车".center(40))
                        print("4、结算购物车".center(40))
                        c3 = input("请输入你的选择(按q退出):")
                        if c3 == "q":
                            break
                        elif c3 == "1":
                            current_system.check_message()
                        elif c3 == "2":
                            goods_id = input("请输入你要购买的商品编号:")
                            goods_num = input("请输入你要购买的数量:")
                            if goods_id not in current_system.goods_info:
                                print("商品编号输入错误！请重新输入！")
                                continue
                            current_system.add_goods(goods_id, goods_num, name)
                        elif c3 == "3":
                            current_system.check_cart(name)
                        elif c3 == "4":
                            current_system.pay_cart(name)
                        else:
                            print("输入错误，请重新输入！")
                else:
                    print("用户名或密码错误，登录失败！")
            elif c2 == "2":
                name, passwd, amount = input("请输入你的名字、密码以及初始金额(用空白分隔)").split()
                current_system.register(name, passwd, amount)
                print(f"当前系统用户有{current_system.userdict}")
            else:
                print("输入有误，请重新输入！")
    else:
        print("输入有误，请重新输入！")